股骨核心减压材料植入体生物力学性能的有限元分析

背景：借助计算机辅助分析技术进行股骨坏死后的手术治疗和患者康复的预测分析，实现科学施行手术和更快的术后康复，是目前国际相关研究领域的热点研究问题。目的：通过观察不同的核心减压材料植入体对股骨头的受力变形和应力分布、骨折风险以及在交界面处的生物力学性能的影响情况，为选择合适的核心减压材料植入体提供依据。方法：基于6例患者的股骨坏死区域的核磁共振扫描图片，建立3D股骨几何模型和有限元分析模型，并设定生理负荷量和4种不同种类的材料植入体Actifuse，BioOss，Osteoset，Prodense，应用有限元分析软件AnsysWorkbench对股骨性能进行分析计算。结果与结论：实验得到了股骨在工作过程中的最大应力分布规律，随着4种填充材料杨氏模量数值的升高，股骨坏死区域的最大正应力的数值下降，但同时交接面处的生物力学性能如滑动距离、摩擦应力和压力数值升高。文章在综合考虑骨折危险和交接面处的生物力学性能的基础上，对比了4种材料的力学性能后，推荐了合适的核心减压材料为Osteoset。中国组织工程研究杂志出版内容重点：人工关节；骨植入物；脊柱；骨折；内固定；数字化骨科；组织工程

Finite element analysis of biomechanical properties of femoral core decompression materials

BACKGROUND:With the help of computer aided analysis technique, the prediction and analysis of the surgical treatment and rehabilitation of patients with femoral necrosis, which can realize the scientific operation and recovery of the patients after surgery, is a hot research topic in the field of international related research.OBJECTIVE:By studying the force deformation and stress distribution, fracture risk, and Interface’s biomechanical properties of the femoral head in different core decompression materials, we can provide the basis for choosing the appropriate core decompression material.METHODS:Based on nuclear magnetic resonance imaging images of six patients with different ages, the three-dimensional model and finite element analysis model were established, and the physiological load and four different types of materials (Actifuse, BioOss, Osteoset, Prodense) were set up. Finite element analysis software AnsysWorkbench was used to analyze the performance of the femur.RESULTS AND CONCLUSION:The maximum stress distribution law of the femur in the work process was obtained. With the increase of the Young’s modulus of the material, the maximum normal stress of the femoral necrosis region was decreased, but the biomechanical properties of the joint surface, such as sliding distance, friction stress and pressure, are increased. On the basis of comprehensive consideration of the biomechanical properties of the fracture risk and the junction, a suitable core decompression material (Osteoset) is recommended.